Can you take a picture of your set up for us as well?
As for the log hide, it's best not to use them. Ball pythons prefer hides that enclose all sides of them. Plus the logs tend to mold easily and are difficult to sanitize. Try getting a similar hide as that rock one you have.
I'm not really familiar with using bulbs, so hopefully someone who uses them will chime in. Do you know what humidity your tank has? Lights tend to suck the humidity out like a sponge. Maybe invest in a heating mat (on a thermostat)?
You want to keep the hot side consistently around 90. Dipping down to 75 sounds drastic. Anything below 75 is potentially dangerous and promotes Respiratory infection.
Some balls prefer being on the cool side. But I bet if you switched the hot side log hide with the rock hide, she'll stay in the hot side. The rock hide gives them more security than the duel opening log.